Research On Hub And Pitch Mechanism Of Inverted Cone Offshore Vertical Axis Wind Turbine

Compared with offshore wind power,onshore wind power technology is mature and developing rapidly,and has become the fastest growing energy in the world in the past decade.However,due to the limited land space and the increasingly fierce competition in the early stage development of wind power projects,the development potential of land-based wind power is increasingly exhausted.The potential of offshore wind power is huge.China is rich in offshore wind resources,which has high development value.Compared with horizontal axis wind turbine,the research of vertical axis wind turbine is relatively lagging behind,but vertical axis wind turbine is more and more favored and concerned by experts at home and abroad because of its natural advantages of low manufacturing and installation cost,convenient maintenance and no need for yaw installation..In order to respond to the development trend of the wind power industry,this paper will study a kind of vertical axis wind turbine,which is suitable for offshore wind power generation.Because wind turbine is the most important part of wind turbine,the design of wind turbine will directly determine the efficiency and service life of wind turbine.In order to solve the requirement of real-time blade pitch,the hydraulic pitch system and the electric servo pitch system are analyzed and compar ed comprehensively and meticulously.Through the decision to adopt the electric servo which is more suitable for this paper as the pitch mechanism,but the traditional electric servo pitch system is difficult to meet the requirement of fast response and real-time pitch,so the direct drive type suitable for this paper is designed on this basis Electric pitch mechanism.The model of pitch mechanism is established,and the load of pitch mechanism is analyzed and calculated.On this basis,the design of direct drive pitch mechanism is completed.Hub,as the main bearing component connecting the blade and the main transmission system,is one of the key components of wind turbine.The design of wheel hub is lack of relevant codes and standards,and it is often cu mbersome to meet the strength requirements.In this paper,the configuration design of the hub is completed firstly,and then the preliminary design of the hub is carried out according to the previous experience.The solid model of the hub in the project i s established.Based on the aerodynamic load of the blade,the static simulation analysis of the load of the hub under the extreme wind speed is carried out,and the strength check of the hub is completed.On the basis of ensuring the correctness and reliability of the static analysis process,the structure of the hub is further optimized.In this paper,two methods are used to optimize the hub,one is to use the topology optimization module of ANSYS to optimize,the other is to directly reduce the hub wall thickness,and then use UG modeling to carry out static load analysis,compared with the results without optimization,and compared with the two optimization results,it is concluded that reducing the hub wall thickness is a more reasonable optimization result.